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Which undiscovered elements did Dmitri Mendeleev predict?
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chemical element
The geochemical cycle.
In his 1871 version of the periodic table, Dmitri Mendeleev identified gaps where he believed unknown chemical elements would eventually be placed. Based on the periodicity of properties he observed, he accurately predicted the existence and characteristics of three specific elements:
The subsequent discovery of these elementsāgallium in 1875, scandium in 1879, and germanium in 1886āprovided strong evidence for the validity of his periodic law and helped the system gain widespread acceptance within the scientific community.123